High temperature gas-cooled reactor particle flow velocity field measurement device and method

Abstract

The invention relates to a particle flow speed field measuring device and method of a high-temperature air cooling pile. A vertical lift platform of the device is provided with a horizontal and vertical movement platform to form a mechanical console, the horizontal and vertical movement platform is provided with a laser emitter, a concave lens and a CCD linear array camera, the laser emitter and the concave lens form an incident light path, the CCD linear array camera is connected with a computer to form a scattered signal collecting and processing unit, and spherical particles are placed in atunnel type roller; and laser emitted by the laser emitter is diffused to the spherical particles by penetrating the concave lens, the CCD linear array camera received a formed speckle image in the far end, the image is processed by the computer, movement of the mechanical platform is controlled, and the whole tunnel type roller is scanned. The method has the advantage of high time-space resolution, extremely slow particle movement can be detected effectively, the particle pulsation speeds in different positions in the high-temperature air cooling pile can be obtained, the pulsation speeds represent the violent degree of particle speed change, and the speed field distribution of the particles is obtained from an empirical coefficient based on the particle pulsation speed.

Description

technical field [0001] The invention relates to a method and device for measuring particle velocity, in particular to a method and device for measuring particle flow velocity in a high-temperature gas-cooled reactor. Background technique [0002] Energy shortage is a major problem facing the world today. The gradual depletion of fossil fuels and the need for environmental protection have drawn more and more attention to nuclear energy, a clean energy source. The ultra-high temperature reactor and the molten salt reactor among the current mainstream candidate reactor types both use spherical fuel elements. The radial and axial velocity distributions of hundreds of thousands of particles are the basis for core geometry design, reactor physics, and nuclear fuel cycle calculations. At present, in the world, the ball flow velocity distribution is mainly based on empirical judgment, and the optimization design of the temperature and power distribution in the reactor is carried ou...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of insufficient temporal and spatial resolution existing in the current method for measuring the particle flow of high-temperature gas-cooled reactors, and proposes a device and method for measuring the velocity field of particle flow in high-temperature gas-cooled reactors based on dynamic speckle measurement. The device and method have the advantages of The advantages of high temporal and spatial resolution can effectively detect the extremely slow particle motion, and obtain the particle pulsation velocity at different positions in the high-temperature gas-cooled reactor. The pulsation velocity is used to characterize the severity of the particle velocity change. Velocity field distribution of exiting particles

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